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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import './BridgeBase.sol';

contract BridgeEth is BridgeBase {
  constructor(address token) BridgeBase(token) {}

  function burn(address to, uint amount, uint nonce, bytes calldata signature) external virtual override {
    _beforeTokenTransfer();
    bytes32 message = prefixed(keccak256(abi.encodePacked(
      msg.sender,
      to,
      'ETH-BURN',
      amount,
      nonce
    )));  
    require(recoverSigner(message, signature) == admin, 'wrong signature');
    require(processedNonces[msg.sender][nonce] == false, 'transfer already processed');
    processedNonces[msg.sender][nonce] = true;
    token.bridgeBurn(msg.sender, amount);
    emit Transfer(
      msg.sender,
      to,
      'ETH-BURN',
      amount,
      block.timestamp,
      nonce,
      signature,
      Step.Burn
    );
  }

  function mint(
    address from, 
    address to,
    uint amount, 
    uint nonce,
    bytes calldata signature
  ) external virtual override {
    _beforeTokenTransfer();
    bytes32 message = prefixed(keccak256(abi.encodePacked(
      from, 
      to,
      'ETH-MINT',
      amount,
      nonce
    )));
    require(recoverSigner(message, signature) == admin, 'wrong signature');
    require(processedNonces[from][nonce] == false, 'transfer already processed');
    processedNonces[from][nonce] = true;
    token.bridgeMint(to, amount);
    emit Transfer(
      from,
      to,
      'ETH-MINT',
      amount,
      block.timestamp,
      nonce,
      signature,
      Step.Mint
    );
  }

  function _beforeTokenTransfer() internal override { 
      require(!paused(), "ERC20Pausable: token transfer while contract paused");
  }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import './interfaces/IERC20.sol';
import './interfaces/BridgeToken.sol';
import './abstracts/Ownable.sol';
import "./abstracts/Pausable.sol";

contract BridgeBase is Ownable, Pausable {
  address public admin;
  IToken public token;
  mapping(address => mapping(uint => bool)) public processedNonces;

  enum Step { Burn, Mint }
  event Transfer(
    address from,
    address to,
    string operation,
    uint amount,
    uint date,
    uint nonce,
    bytes signature,
    Step indexed step
  );

  constructor(address _token) {
    admin = msg.sender;
    token = IToken(_token);
  }

  function setAdmin(address new_admin) external onlyOwner {
    require(new_admin != address(0), "zero address not allowed");
    admin = new_admin;
  }

  function burn(address to, uint amount, uint nonce, bytes calldata signature) external virtual {}

  function mint(
    address from, 
    address to, 
    uint amount, 
    uint nonce,
    bytes calldata signature
  ) external virtual {}

  /**
    * @dev Pause `contract` - pause events.
    *
    * See {BEP20Pausable-_pause}.
    */
  function pauseContract() external virtual onlyOwner {
      _pause();
  }
  
  /**
    * @dev Pause `contract` - pause events.
    *
    * See {BEP20Pausable-_pause}.
    */
  function unPauseContract() external virtual onlyOwner {
      _unpause();
  }

  /**
    * @dev Hook that is called before any transfer of tokens. This includes
    * minting and burning.
    *
    * Calling conditions:
    *
    * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
    * will be to transferred to `to`.
    * - when `from` is zero, `amount` tokens will be minted for `to`.
    * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
    * - `from` and `to` are never both zero.
    *
    * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
    */
  function _beforeTokenTransfer() internal virtual {}

  function prefixed(bytes32 hash) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(
      '\x19Ethereum Signed Message:\n32', 
      hash
    ));
  }

  function recoverSigner(bytes32 message, bytes memory sig)
    internal
    pure
    returns (address)
  {
    uint8 v;
    bytes32 r;
    bytes32 s;
  
    (v, r, s) = splitSignature(sig);
  
    return ecrecover(message, v, r, s);
  }

  function splitSignature(bytes memory sig)
    internal
    pure
    returns (uint8, bytes32, bytes32)
  {
    require(sig.length == 65);
  
    bytes32 r;
    bytes32 s;
    uint8 v;
  
    assembly {
        // first 32 bytes, after the length prefix
        r := mload(add(sig, 32))
        // second 32 bytes
        s := mload(add(sig, 64))
        // final byte (first byte of the next 32 bytes)
        v := byte(0, mload(add(sig, 96)))
    }
  
    return (v, r, s);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

interface IToken {
  function bridgeMint(address to, uint amount) external returns (bool);
  function bridgeBurn(address owner, uint amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    function migrateMint(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "byzantium",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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00000000000000000000000001d9fb3a09e5b34282edb1f13b7eccb2efc2907c

-----Decoded View---------------
Arg [0] : token (address): 0x01d9Fb3A09e5b34282edb1f13b7EcCb2eFC2907C

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000001d9fb3a09e5b34282edb1f13b7eccb2efc2907c